Chimney construction



Aug- 1945 4 R. w. McLAUGHLlN, JR 2,381,548 v CHMEY CONSTRUCTION FiledApril 29, 1.942

l Patented 7, 1945' A* l nandiedf-andfrapidxy assembleey building*around the f ehiinrfeyi,

sanne? tqafprzovidej ineens-fief 'rein 1ste-df vfluegies-condensateffttm the:

, .,t'onrdvidejans fesse `rtt-s's'emtu beobvious and W' d dit; and:

2 t 'come l l 1-; Thsfinventiornfrelatesftot Yan improvedfeliirnney Iconstituction;` laiidimorefnenticular-1ysto-a2chirnifiey:

ycons'trucltiolfii; which'. the "ent'i1-'e2y weight yof ,the

chimneyissupportedbythe'noof oitheybriilding: I

y* lffAn"fofbjectzofi the? inventionmis': tos-.fnrovidefa y chimneyiwhich may. be readily eheanlyfc'em Lfabricated sections, whicn..istiight in weight,

durable, rsafefandweflieient andi IWlii'clfimay if desired; be4disassembled andi-.2 :te-used' anothen Ivide "adequt'el4 ventilation.Yfcr' hetattie ofthe to prnvde' means'. for protecting"exnoseci'f`se'ctierrs".` 615 the lmiey fromwontact'fwith sinnmmable materialteinte'- pined itt` the A eenstriuetidn'nereinttfteiy set" forthnitneufs eefthe application @which 111:- befindiestedffin'tneelaimsn f vif Fori af' sti-llQfliitlieii understandin@ of "tlie fmvii `tion,reference should be had tothe following* detailed.clesciption. taken inconnectionwith the aocompa'nyingfdrawingwherein: I Tf1-fg. Iigiureffllis at-view? in vertida-1 sectionzi-Cf aportion ofthereofandlupper-portionlof thefvchirnney; of a: dwellingy .equippedAwith ,frat-preferred feinbodi ment of the inventiontw j z Fig. 2 is aplan View of the; top.,of ,thechimney I Witn certain Qpartsssliown. n,dottedg lines,

clanty vieiiv` l-lnartiily ing-elena orilandftpan-Q Eigv 5i is, ardetail,viewe'inavest/icalY section'. ofla portion of." affine.`embodyiirxgs the `invention In the yemitc 'd;i\In'entf ofethefinventionfshown-,in the drawing; the-chimney iiue comprises:eithera. single longJ uessection lor` preferably a, plurality-y of;relatively shortandyeasily handledr seetionslo standartd'gzlength;forfea'fa-nfrpleA three; feet; bolted 051' otherwise fastened-together:to provide a con;-

tinuous fluegev and suspended; inx4 at manner here-.-

Alltl'ie intermediateiuefsections @l 0: may; if defsired,loe-.fdfeifitinai.-` Each may: comprises-esubstantiallywcylindnieal,ste'eifftube l-Ufls of suitable diametei,y for example eight, -rinehesjhaving f its innerlandf outer y-sunfanzesi ,coatedwitht a vitreousenamel layer,lflir2;l l Eachfflue section shouldtapen .u

tion, ofeacfn fiuefseotinfmalyfle provided witi an asbestestpaperrgaskehl 211311. other' suitaliier means to insure-:fain:adequatelyftight betweensucres;

sive=sectons". "Eachsectiorr may bezpr'ovd'ed with y lugs'. or, "other'suitable-'bolt rece/ivingk means 141i at each en'dthereof"'andipeferablyfwithga-spluiality;

for examle'"three,-iofl such lugss ati eachrend'; evenly yspaced around.the r-outer` surface of the section, to insure rapidfandfeasy'assemblyfof seo-- tions and fa'de'quat'e support" i:eiiiveen?vsire-Cessive 1 means-for. lx-iougnipingthe ne section, thereom Thelowermost; chimney,flueY section v24difllers from-"theothersfinfthat:itisffprovided withsan.

' and theadjacent lroof pithelstnmtune sho-wnin Eig Y sections;

' Ihe uppermostfand' lowermost sections each differs slightly from' therstanclaidform offthe im termedat'e flue Asections`v .Thej'uppermost:nue-2 section llisfprovidd adjacentyits'npnn t'ed-sie ,withva plurality51A apertures'adaptedftmreeeive they rivets or belts `imy by whicnfit"isv connected nientf as yhereinafter-f des iriiged; It w parent,however, that the] uppermost f manif desired, beidentieal'withtheinternediate n sections1 Ill1 in. ,which caseY thegange 32,0-vvlfillbl; be. provided` with a., plurality Yof., lugs to,..pr ovideyellonxzv,v 2,6', adaptedzfto-receive, a section onstoxle-1 pipelitvleadirrigz ltriomf the furnace on. heater 3.0; Tghe seetion- 24l1smoreover provided.4 at: its.flowerI end Withyt. suitable oleanout cap3-2 .andwi-thfa; pipe or. drain: 34;. Thisf last-mentioned/element is'oi considerable vimportance.: Itis intended that it remain ogeng,thuseprovidingatcondnit;

forl the-remeyaljof flue; gas,l condensatie, which collects rathenrapidly the bottom ofrvtl'ie f y 2,381,548 f 34 is shownas'. Xtndingtherethrough; It will ,be apparent, however, that drain 34 need note'xtend through a cellar oor if the presence of a small amount ofcondensate.the1eon is not jectionable.

Tests have established that a chimney made of flue sections such as havebeen described will not ordinarily become heated sufficiently toapproach the ignition temperature -of wood. For example, if stack gastemperatures not exceeding 835 degrees F. are maintained, the surfacetemperature of that portion of the chimney nue likely to passthroughbuilding construction will not exceed 250 degrees'fF.; a. temperaturewhich provides an 4adequate safetymarginI even .should `there be actualcontact' betweenchimney flue and a` portion 'of' the 'framestructure ofthe dwelling. In order, however, to insure against such contact it isintended that where the chimney passes through aceiling, iioor or wall,means, preferably of poor heat conductivity, should be provided toinsure the positioningY of the chimney flue between, `and not in contactwith, adjacent studs or joistsi' Such means-(not shown) may comprise`straps toposition the flue, or asbestos packing or the like.` Moreover,where the chimney 'flue fis'likel'y- 't'ocom'el in contact' withinflammableV material' as, for example, f in an attic, wherelsuchxnaterial may be placed against the flue, a` modified'form of fluesectionmay be employed.A Such a modified' form of section is shown in'Figs. 1 and 4. 'Ihe basic 'flue section l0 may be provided, adjacentitsupper-and lower ends, with-collars or rings 40 of heat insulatingmaterial,l and these collars may support an outer cylindrical shell42 ofsteel, for example. This shell may be"spaced suficiently from the fluesectionl Il! toprovideA adequate protection and it may be vented as atMin several places to insure circulation of air therethrough. l

1- In they embodiment of the invention shown in the drawing, the chimneyflue such as has been described, `or anequivalent thereof, is suspendedfrom. the roof of the building in the following manner; A `supportingmember V50, of any deof the same general cross-sectional shape as themember 50. The element 22 may, however, be somewhat longer than themember 50, although of approximately similar breadth. In addition to thecentral depending circular flange 20, to which the chimney iiue isafxed, the member 22 is provided with a depending, rigid skirt or ange64 to which the element 50 is affixed as at S5, by bolts, rivets orother suitable means along two opposite sides. As will be clearlyapparent lfrom Fig. 1, the upper edge of the supporting member 50 isspacedlfrom the top of the chimney cap element 22. Moreover, the member50 is of considerably larger4 internal over-all diameter than the`diameter of flue section I6. It is thus `apparent thati surrounding thechimney ue I there is provided a passage for Ventilating the sired sizefand shape,-but preferably rectangular in `cross-,section and made ofsheetsteel or other suitable-material` of such rigidity and strengthasto perform adequately its intended functions, isMnailed-orotherwiseaffixed to two adjacent roof rafters 52, alongthe center 4lines thereof,as indicated at 5'4in Fig. 2. As shown, the lower portion` of the.supporting .member 5B Vextends laterally 'as a skirt 5B, which servesas dashing. Itis through this portion of the supporting member 5D that`it is affixed to the rafters 52.` The final roof covering,v whethershingles or other material, may o verlie the flashingSt',` as showndiagrammatically in Fig. 1 at 58, while the iiashing may rest directlyon the rafters 52- or upon theboards used to rough-close the roof, ifused, as isliown in Figs. 1 and 2 at 60. Ifdesired, the upper edge ofthe element 5l) may be rolled over as shown most clearly in Fig.1`fat`v82 to provide increased rigidity and strength.

The chimney cap element 22, also preferably of,she`et steel orsimilar'material, is' preferably' attic, thus preventing condensationtherein even though the attic is not otherwise heated. The arrows 10illustrate how heated air may flow from the attic, up along the chimneyflue and out between the top of member and chimney cap 22. The dependingflange 6d is preferably of such length, as clearly shown in Fig. 1, asto provide protection from `the weather for the ventilation passage justdescribed. Where affixed to member 50, flange 64 should of course beagainst the outer face of member 50.

Suitable standard meansv (not shown) may be employed to protect the flueopening in the cap element 22 from rain, snow and the like.

Ashas been mentioned, a chimney construction embodying the presentinvention is admirably adapted 'for use iniinexpensive dwellings of theprefabricated and demountable type. Such a chimney is itselfdemountable. It may be salvaged entirely, should the dwelling in whichit is in use be dismantled. The individual iiue sections may be re-,usedtoconstruct other chimneys, or the entire chimney structure may bereassembled in a new location. Furthermore, in the initial constructionand in each re-use of 'the flue sections, the 'assemblyis a dry job.

No masonry is required and the building cost is thus substantiallyreduced. .The method of suspending the chimney flue *from the roof, asherein described, has beenvfound to be greatly preferred over aconstruction in which the chimney is supported from the bottom. In fact,with chimney flues of the character described,` the overhead suspensionof the present linvention has been found practically a necessity.

Since certain changes may be `made in the above construction anddifferent embodiments of the invention could be made without depart-ling from the scope thereof, itis intended that all matter contained inthe abovedescription or shown in the accompanying drawing shall beinterpreted'as illustrative and notin a limiting sense. l

It is also to be understood that the following claims are intended toCoverall the generic and specific features of the invention hereindescribed, and all statements of the scope of the inventionwhich, as amatter vof language, might be said to fall therebetween.

What is claimed is:

1.Y Ina, building construction of the character described, incombination, a chimney comprising a plurality of demountable uesections, means for` fastening said sections together in substantiallyend-to-end relation, means, including spaced rafters, providing a rooffor said building, a chimney-supporting member, rectangular incross-section, aiiixed to a plurality of said rafters and a chimney capelement affixed to `the uppermost flue section and to two opposite wallsof said supporting member Whereby said chimney is entirely suspendedfrom said n roof, said cap element having a downwardly dea plurality ofdemountable i'lue sections; each of said sections tapering gradually indiameter from a maximum diameter at its upper end to a minimum diameterat its lower end, means for fastening said sections together insubstantially section positioned within the upper end of the nextadjacent lower section, means, including spaced rafters, providing aroof for said build,- ing, a Vchimney-supporting member, rectangular incross-section, aixed to a plurality of said rafters and a chimney capelement aixed to the I uppermost'flue section and to two opposite wallsof Said supporting member whereby said chimney is entirely suspendedfrom said roof, said .cap element having a downwardly depending flangespaced from and positioned outwardly of the two walls of said supportingmember to which said cap is not afxed, whereby there is provided aVentilating conduit, shielded from the weather, between said rsupportingmember and the uppermost flue section.

' ROBERT W. McLAUGI-ILIN. JR.A

vend-to-end relation with the lower end of each

